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          <h1 class="post-title" itemprop="name headline">Java-Proxy动态代理</h1>
        

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        <p>####1. 动态代理概念：</p>
<ul>
<li>代理对象存在的价值: 主要用于拦截对真实业务对象的访问。</li>
<li>代理对象有什么方法: 一般来说，真实业务对象具有什么方法，那么代理对象就会具备相应的方法。<a id="more"></a>
</li>
</ul>
<p>####2. 设计要素</p>
<ul>
<li>代理谁？<br>须设计一个类变量，以及一个构造函数，记住代理类代理哪个对象。</li>
<li>如何生成代理对象？<br>设计一个方法生成代理对象（在方法内编写代码生成代理对象是此处编程的难点）<br>####3. Proxy类<br>Java提供了一个Proxy类，调用它的newInstance方法可以生成某个对象的代理对象，使用该方法生成代理对象时，需要三个参数：</li>
<li>生成代理对象使用哪个类装载器。</li>
<li>生成哪个对象的代理对象，通过接口指定。</li>
<li>生成的代理对象的方法里干什么事，由开发人员编写handler接口的实现来指定。<br>####4. 注意</li>
<li>Proxy类负责创建代理对象时，如果指定了handler（处理器），那么不管用户调用代理对象的什么方法，该方法都是调用处理器的invoke方法。</li>
<li>由于invoke方法被调用需要三个参数：代理对象、方法、方法的参数，因此不管代理对象哪个方法调用处理器的invoke方法，都必须把自己所在的对象、自己（调用invoke方法的方法）、方法的参数传递进来。<br>####5. 约定：要想创建某一个对象的代理对象，那么该对象必须实现一个接口。<br>####6. 简单示例<br>1). 创建接口Person<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">public interface Person &#123;</span><br><span class="line">	/**</span><br><span class="line">	 * 唱歌</span><br><span class="line">	 */</span><br><span class="line">	void sing();</span><br><span class="line">	/**</span><br><span class="line">	 * 跳舞</span><br><span class="line">	 */</span><br><span class="line">	void dance();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<p>2). 创建实现Person接口的PersonImpl类<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImpl implements Person&#123;</span><br><span class="line"></span><br><span class="line">	@Override</span><br><span class="line">	public void sing() &#123;</span><br><span class="line">		System.out.println(&quot;开始唱歌&quot;);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	@Override</span><br><span class="line">	public void dance() &#123;</span><br><span class="line">		System.out.println(&quot;开始跳舞&quot;);</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>3). 创建代理类<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImplProxy &#123;</span><br><span class="line">	</span><br><span class="line">	private Person person = new PersonImpl();</span><br><span class="line">	</span><br><span class="line">	/**</span><br><span class="line">	 * 创建代理</span><br><span class="line">	 * @return 返回值是接口类型</span><br><span class="line">	 */</span><br><span class="line">	public Person createProxy() &#123;</span><br><span class="line">		/**</span><br><span class="line">		 * 产生某个对象的代理对象</span><br><span class="line">		 * ClassLoader loader    当前代理对象的类加载器</span><br><span class="line">		 * Class&lt;?&gt;[] interfaces 代理对象的接口</span><br><span class="line">		 * InvocationHandler h	 InvocationHandler对象</span><br><span class="line">		 */</span><br><span class="line">		return (Person) Proxy.newProxyInstance(PersonImplProxy.class.getClassLoader(), person.getClass().getInterfaces(), new InvocationHandler() &#123;</span><br><span class="line">			</span><br><span class="line">			/**</span><br><span class="line">			 * @param proxy 把代理对象自身传进去</span><br><span class="line">			 * @param method 代表当前调用的方法</span><br><span class="line">			 * @param args 当前调用方法的参数</span><br><span class="line">			 */</span><br><span class="line">			@Override</span><br><span class="line">			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable &#123;</span><br><span class="line">				// 编写代码</span><br><span class="line">				return null;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>4). 编写Demo类中主函数main()<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">public class Demo &#123;</span><br><span class="line">	public static void main(String[] args) &#123;</span><br><span class="line">		PersonImplProxy proxy = new PersonImplProxy();</span><br><span class="line">		Person person = proxy.createProxy();</span><br><span class="line">		person.sing();</span><br><span class="line">		person.dance();</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>5). 实现代理对象中的createProxy方法中的invoke方法<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImplProxy &#123;</span><br><span class="line">	</span><br><span class="line">	private Person person = new PersonImpl();</span><br><span class="line">	</span><br><span class="line">	/**</span><br><span class="line">	 * 创建代理</span><br><span class="line">	 * @return 返回值是接口类型</span><br><span class="line">	 */</span><br><span class="line">	public Person createProxy() &#123;</span><br><span class="line">		/**</span><br><span class="line">		 * 产生某个对象的代理对象</span><br><span class="line">		 * ClassLoader loader    当前代理对象的类加载器</span><br><span class="line">		 * Class&lt;?&gt;[] interfaces 代理对象的接口</span><br><span class="line">		 * InvocationHandler h	 InvocationHandler对象</span><br><span class="line">		 */</span><br><span class="line">		return (Person) Proxy.newProxyInstance(PersonImplProxy.class.getClassLoader(), person.getClass().getInterfaces(), new InvocationHandler() &#123;</span><br><span class="line">			</span><br><span class="line">			/**</span><br><span class="line">			 * @param proxy 把代理对象自身传进去</span><br><span class="line">			 * @param method 代表当前调用的方法</span><br><span class="line">			 * @param args 当前调用方法的参数</span><br><span class="line">			 */</span><br><span class="line">			@Override</span><br><span class="line">			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable &#123;</span><br><span class="line">				// 编写代码</span><br><span class="line">				// 获取方法名</span><br><span class="line">				String methodName = method.getName();</span><br><span class="line">				if (&quot;sing&quot;.equals(methodName)) &#123;</span><br><span class="line">					System.out.println(&quot;啦啦啦啦啦啦啦啦&quot;);</span><br><span class="line">					method.invoke(person, args);</span><br><span class="line">				&#125; else if (&quot;dance&quot;.equals(methodName)) &#123;</span><br><span class="line">					System.out.println(&quot;哈哈哈哈哈哈哈哈&quot;);</span><br><span class="line">					method.invoke(person, args);</span><br><span class="line">				&#125; else &#123;</span><br><span class="line">					System.out.println(&quot;啊啊啊啊啊啊啊啊&quot;);</span><br><span class="line">				&#125;</span><br><span class="line">				return null;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line">	&#125;</span><br><span class="line">	</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>6). 调用main方法，打印结果：<br><img src="https://upload-images.jianshu.io/upload_images/3110861-08acc0d4b4fb669b.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图1.png"></p>
<p>####6. 高级进阶–接口方法中带参数带返回值<br>1). 创建Person接口<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">public interface Person &#123;</span><br><span class="line">	/**</span><br><span class="line">	 * 唱歌</span><br><span class="line">	 * @param name 歌曲名</span><br><span class="line">	 * @return</span><br><span class="line">	 */</span><br><span class="line">	String sing(String name);</span><br><span class="line">	/**</span><br><span class="line">	 * 跳舞</span><br><span class="line">	 * @param name 舞曲名</span><br><span class="line">	 * @return</span><br><span class="line">	 */</span><br><span class="line">	String dance(String name);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>2). 创建实现Person接口的PersonImpl类<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImpl implements Person &#123;</span><br><span class="line"></span><br><span class="line">	@Override</span><br><span class="line">	public String sing(String name) &#123;</span><br><span class="line">		System.out.println(&quot;唱&quot; + name);</span><br><span class="line">		return &quot;唱完了&quot;;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">	@Override</span><br><span class="line">	public String dance(String name) &#123;</span><br><span class="line">		System.out.println(&quot;跳&quot; + name);</span><br><span class="line">		return &quot;不好玩&quot;;</span><br><span class="line">	&#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>3). 创建PersonImpl的代理类<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImplProxy &#123;</span><br><span class="line">	private Person person = new PersonImpl();</span><br><span class="line">	</span><br><span class="line">	public Person createProxy() &#123;</span><br><span class="line">		return (Person) Proxy.newProxyInstance(PersonImplProxy.class.getClassLoader(), person.getClass().getInterfaces(), new InvocationHandler() &#123;</span><br><span class="line">			</span><br><span class="line">			@Override</span><br><span class="line">			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable &#123;</span><br><span class="line">				// 编写代码</span><br><span class="line">				return null;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>4). 编写Demo类中主函数<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">public class Demo &#123;</span><br><span class="line">	public static void main(String[] args) &#123;</span><br><span class="line">		PersonImplProxy proxy = new PersonImplProxy();</span><br><span class="line">		Person person = proxy.createProxy();</span><br><span class="line">		System.out.println(person.sing(&quot;说散就散&quot;));</span><br><span class="line">		System.out.println(person.dance(&quot;体面&quot;));</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>5). 实现代理对象中的invoke方法<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">public class PersonImplProxy &#123;</span><br><span class="line">	private Person person = new PersonImpl();</span><br><span class="line">	</span><br><span class="line">	public Person createProxy() &#123;</span><br><span class="line">		return (Person) Proxy.newProxyInstance(PersonImplProxy.class.getClassLoader(), person.getClass().getInterfaces(), new InvocationHandler() &#123;</span><br><span class="line">			</span><br><span class="line">			@Override</span><br><span class="line">			public Object invoke(Object proxy, Method method, Object[] args) throws Throwable &#123;</span><br><span class="line">				// 编写代码</span><br><span class="line">				String methodName = method.getName();</span><br><span class="line">				if (&quot;sing&quot;.equals(methodName)) &#123;</span><br><span class="line">					System.out.println(&quot;啦啦啦啦啦啦&quot;);</span><br><span class="line">					return method.invoke(person, args);</span><br><span class="line">				&#125; else if (&quot;dance&quot;.equals(methodName)) &#123;</span><br><span class="line">					System.out.println(&quot;哈哈哈哈哈哈&quot;);</span><br><span class="line">					return method.invoke(person, args);</span><br><span class="line">				&#125; else &#123;</span><br><span class="line">					System.out.println(&quot;哈哈哈哈哈哈&quot;);</span><br><span class="line">				&#125;</span><br><span class="line">				return null;</span><br><span class="line">			&#125;</span><br><span class="line">		&#125;);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></p>
<p>6). 执行主函数, 打印结果<br><img src="https://upload-images.jianshu.io/upload_images/3110861-3de3782e785b128c.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" alt="图2.png"></p>
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